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When you approach a traffic light and step on the brakes, the car body shakes with a “rattle” and “rattling”.
It is a symptom that is surprisingly common in VW, and behaviors such as rattling only at low speeds, shaking just before stopping, and jerking the moment the brakes are returned.
This is not only caused by braking, but also by multiple factors such as DSG control and load fluctuations on the engine side.
If left unattended, it will not only be difficult to drive in traffic jams, but it may also put a strain on other parts.
In this article, we will explain in an easy-to-understand manner the causes of “jerking” symptoms when slowing down and how to distinguish them.
▼Diagnostic navigation of poor driving▼
Shock occurs when starting and decelerating
👉 Summary of the causes of poor driving
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- Common symptoms
- There are five main causes
- Cause (1): Brake rotor distortion (DTV)
- Cause (2) 😀 SG shift shock (common when in low gear)
- Cause (3): Engine rotation drop (idle control shaking)
- Cause (4): Deterioration of the engine mount (unable to absorb shock)
- Cause (5): Deterioration of lower arm bushing and subframe bushing
- Points that can be checked in DIY
- Is it okay to drive? (Estimated risk level)
- Approximate repair cost
- Inspection list of relevant locations
- Conclusion
- Defect details by vehicle type
- Frequently Asked Questions (FAQs)
Common symptoms
- When the car slows down and falls below 10 km/h, the car body shakes
- Just before it stops, it becomes stronger
- The shaking changes when the brake is stepped on
- Creep becomes stronger or weaker
- When you release the brakes, you feel like the car is moving forward.
- Symptoms intensify when the air conditioner is turned on
There are five main causes
- Brake rotor distortion (DTV)
- DSG shift shocks (especially DQ200)
- Drop in engine speed (idle control disturbance)
- Engine mount deterioration (shaking is directly transmitted)
- Deterioration of the drivetrain bushing (forward and backward sway just before stopping)
Cause (1): Brake rotor distortion (DTV)
When does it happen?
- Vibration with a certain period of “gagging” while stepping on the brake
- The steering wheel also vibrates slightly
- Common shaking from high to low speeds
Why do I have symptoms?
If
there is an uneven rotor thickness (DTV), it is pushed back to the brake pads every time it rotates→ Periodic vibrations are transmitted to the car body.
- Quick cooling immediately after washing the car
- Pad burn
- Pad Effect
It is easy to get up.
If left unattended?
- Vibration worsens
- Accelerated wear of pad rotors
- Reduced braking performance
Cause (2) 😀 SG shift shock (common when in low gear)
When does it happen?
- Deceleration to stop below 20 km/h
- It tends to be jerky when starting
- D→R switching is stiff
Why do I have symptoms?
It is common in the dry 7-speed DSG (DQ200),
and when the control of neutral → first gear and the way the clutch is disengaged becomes unstable,
- Clutch engages abruptly when decelerating
- The deceleration shock just before stopping comes out
It leads to symptoms such as.
This is especially noticeable in the learning value discrepancy.
If left unattended?
- Increased jerking
- Deceleration – unstable start
- May speed up clutch wear
Cause (3): Engine rotation drop (idle control shaking)
When does it happen?
- The tachometer drops with a “stern” just before it stops.
- Easy to shake with air conditioner on
- Idling is a bit unstable
Why do I have symptoms?
When transitioning to idle control while decelerating,
if the rotation drops for a moment due to throttle dirt, airflow error, or change in auxiliary load,
- “Gak” and light shock
- Forward and backward sway before stopping
occurs.
If left unattended?
- The rattling just before the stop gets worse
- Progression to idling disorder
Cause (4): Deterioration of the engine mount (unable to absorb shock)
When does it happen?
- The car body sways back and forth every time it slows down
- Large shock when starting and stopping
- Idle vibration also increases
Why do I have symptoms?
When the mount is broken,
the engine shake is transmitted to the car body as it is → The fine shaking just before the stop is amplified.
In particular, there is a lot of shaking when “D→ stop → start”.
If left unattended?
- Tremors get worse
- Other mounts are also more prone to damage
- DSG shock can also be felt strongly
Cause (5): Deterioration of lower arm bushing and subframe bushing
When does it happen?
- The car body moves with the brake ON/OFF
- Large back-and-forth movement from deceleration to start
Why do I have symptoms?
When the rubber bushing deteriorates,
it will deflect forward and backward when a deceleration load is applied, causing the car body to shake back with the brake release.
Especially around 100,000 km.
If left unattended?
- Increase in jerks just before the shutdown
- Poor handling
- Strange noises are likely to occur at the same time
So there are three options
In such a case, there are three realistic options for VW owners:
(1) First, a mechanic who is strong in diagnosis and estimation of
imported cars will identify the cause and propose the minimum necessary.
▶ Find a VW repair shop (buv.LABO)
(2) Foreign car specialty for appraisal
maintenance history and external parts plus assessment before high-cost repairs.
▶ Free appraisal with foreign car baton
(3) “New car at a fixed price” to avoid repair cost risk Relieve
yourself from breakdown stress with a monthly fee including vehicle inspection, tax, and maintenance.
One point
Even if you think it’s okay because you can run, you’re actually holding a bomb that you don’t know when it will explode.
The sooner you move, the less cost and damage you will have.
Points that can be checked in DIY
- Does it shake “periodically” during braking → Rotor suspicion
- Shaking only below 10km/h → DSG or mount
- Worse with air conditioner on → Engine load system
- → mount with high shock when switching between D/R
- Does the tachometer fall just before it stops?
- Is there strong forward and backward shaking at the moment of removing the brake?
Is it okay to drive? (Estimated risk level)
| Symptoms | Risk level | Comments |
|---|---|---|
| Light rattling | Medium | Driving allowed, early inspection recommended |
| Periodic vibration (rotor) | Intermediate to High | Affects braking performance |
| Strong shock just before the shutdown | High | Difficult to drive in the city |
| Concurrent DSG warnings | Very high | No driving, towing recommended |
When a driving problem occurs, it may be necessary to tow the truck depending on the situation.
In these cases, it may be covered by road assistance or riders of automobile insurance, so it is safe to lightly review the contents of your current contract.
If you may not have a proper understanding of the coverage, you can use a comparison service to check the coverage details and premiums of multiple companies at once. Since you can get a complete picture in a short time, many people use it for repairs and inspections.
👉 Free Car Insurance Bulk Quote Service
Approximate repair cost
| Work Description | Approximate cost |
|---|---|
| Brake rotor replacement | 30,000 to 70,000 yen |
| Throttle Cleaning | 5,000 to 15,000 yen |
| DSG Learning Value Reset | 5,000 to 15,000 yen |
| Engine mount replacement | 20,000 to 50,000 yen |
| Bush replacement (lower arm) | 25,000 to 60,000 yen |
👉Summary of maintenance and custom costs & working days of VW specialty store Nile Plus
Inspection list of relevant locations
- Uneven thickness of the brake rotor
- Throttle Valve Air Flow
- Engine Mount
- Lower Arm Bushing
- DSG learning and measured values
- Rotation control just before stopping
▼List of individual pages about engine and drive system repair and maintenance▼
You can scroll
▼List of individual pages about undercarriage repair and maintenance▼
You can scroll
Conclusion
The symptoms of “jerking” when decelerating can be caused by multiple factors, including brake rotor distortion, DSG control, deterioration of engine revs, and deterioration of mounts and bushings.
In particular, shaking below 10 km/h just before stopping is often related to DSG and mount systems. If symptoms persist, it is safe to have an early check-up.
Even if the symptoms are similar, the causes vary from car to car.
Even if it is the same “jerk”, there are various causes such as brakes, DSG, mounting, and rotation control.
If you are unsure, we recommend that you have it inspected at a maintenance shop.
Defect details by vehicle type
Although the “way of getting out” the defect is similar, “which model has many problems” is slightly different for each car model.
Trends by vehicle model and common breakdown cases among other owners are summarized on the following page.
Frequently Asked Questions (FAQs)
Q1. Is it a brake problem that jerks only when decelerating?
A1. It may be caused by distortion of the brake rotor, but in many cases, multiple factors such as DSG control, engine rotation drop, and deterioration of mounts often overlap. It is difficult to judge only by the brakes, and a comprehensive inspection is required.
Q2. Is it okay to leave the “gak” just before stopping?
A2. You may be able to drive, but if your symptoms worsen, it will be difficult to drive in traffic jams or in the city. If it is caused by DSG or mount-related, the burden on other parts will increase, so it is safe to inspect as soon as possible.
Q3. What are the common causes of shaking only below 10 km/h?
A3. Shaking just before stopping is often related to the deviation of the DSG’s learning values, the deterioration of the engine mount, and the sloppy of the lower arm bushing. If there is a common shaking between high and low speeds, suspect rotor distortion.
Q4. Why do my symptoms get worse when the air conditioner is turned on?
A4. When the air conditioner is running, the engine load increases, so the rotation control becomes unstable and the shaking just before stopping may intensify. The impact is especially great if there is throttle dirt or airflow error.
Q5. How much should I pay for repairs?
A5. For light work, it may cost 5,000 to 15,000 yen (throttle cleaning and DSG learning value reset), but brake rotor replacement is 3 to 70,000 yen, and mount and bush replacement is 2 to 60,000 yen. There is no waste in identifying the cause by first getting a diagnosis.
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